Blowpipe



E. -C. MEEKER AND W. B. WOODSIDE.

BLOWPIPE. APPLICATION FILED NOV. II. 1919.

L W W I. M .1 H 3 n m 2 //K V l 5 CMee/(r W5. WOOOS he NGION D C UNITED STATES PATENT OFFICE.

ERNEST CLIFFORD MEEKER AND WALTER BYRON WOODSIDE, OE HILO, TERRITORY OF HAWAII.

BLOVPIPE.

Specification of Letters Patent.

Patented Mar. 15, 1921.

Application filed November 11, 1919. Serial No. 337,359.

To all whom it may concern:

Be it known that we, ERNEST C. MEEKER and Curran B. VVoonsIDn, citizens of Hawaii, residing at Hilo, Territory of Hawaii, have invented new and useful Improvements in Blowpipes, of which the following is a specification.

This invention relates to blow pipes, particularly to those adapted for use in weld ing, and has for its object the provision of a blow pipe which'is water-jacketed so that the humor or tip will be efiiciently cooled at all times whereby to prevent expansion and consequent loosening of the tip, resulting in back firing, and whereby the burner will be prevented fronr becoming melted or destroyed.

An important object is the provision of a blow pipe of this character in which is provided a water conveying tube secured to a fitting at the burner end of the blow pipe upon which various sizes of tips or burners may be screwed, the fitting being provided with passages permitting entrance and exit of water into and from the burner whereby the burner will be at all times kept cool.

An additional object is the provision of a blow pipe of this character which will be simple and inexpensive in manufacture, efiicient in use, durable in service, and a general improvement in the art.

With the above and other objects and ad vantages in view, the invention consists in the details of construction to be hereinafter more fully described and claimed, and illustrated in the accompanying drawings in which- Figure 1 is a side elevation of the device,

Fig. 2 is a sectional view through the vertical end thereoi on a larger scale,

Fig. 3 is a similar sectional view taken at right angles to Fig. 2,

Fig. 4 is a cross sectional view on the line 4-4 of Fig. 3,

Fig. 5 is a longitudinal sectional view taken at the other end of the device, and

Fig. 6 is a similar view taken at right angles to Fig. 5.

Referring more particularly to the drawings, the numeral 10 designates a tube of suitable diameter and of any proper material, such as brass. This tube is curved at one end, as shown at 11, has secured within its end a fitting 12 within which are sweated the ends of a pair of relatively small tubes 13 and 14 which extend longitudinally within the tube 10. This fitting 12 is provided with pair of bores 15 and 16 which communicate with the tubes 13 and 14, respectively. This fitting 12 has its outer end reduced to provide an extension 17 which is externally threaded, as shown. The burner is disposed upon this end ot the tube 10 and includes an outer portion 18 threaded onto the fitting 12 and the tip portion 19 threaded onto the extension 17. This construction is such as to provide an annular space 20 surrounding the tip 19. The fitting 12 is also provided with relatively small holes 21 which communicate with the annular space 20 and with the tube 10.

W ithin the other end of the tube 10 is secured a fitting 22 into which is sweated the other end of the tube 14 and this fitting 22 is provided with abore 23 communicating with the tube 14. The gas conveying pipe 24 is connected with the fitting 22 by a suitable coupling 25 and this pipe 24 is provided with the usual control cook 26 whereby the flow of gas to the burner may be regulated. Secured to this latter mentioned end of the tube 10 and to a flange 27 on the fitting 22 is a fitting 28 through which extends the other end of the tube 13 and into which extends one end of a tube 29. A suitable control cock 30 is provided in the exterior portion of the tube 13 and is preferably braced by a member 31 disposed upon the tube 29. A suitable water pipe 32 is connected with the cook 30.

In the operation of the device, gas is supplied to the burner through the pipe 24 which conducts the gas through the bore 23 in the fitting 22 and into the tube 14 from which it passes through the passage 16 into the bore of the tip 19. The gas is of course ignited at the tip. The term gas is used though of course it is understood that the gas has air mixed therewith, as is common in blow pipes of this character and the term mixture should therefore be preferably used. YVater passes from the pipe 32 through the cock 30 and through the tube 18 whence it passes through the passage15 into the annular space 20 between the inner and outer portions of the burner. After circulating within the burner, the water passes through the small holes 21. into the space surrounding the tubes 13 and 14 within the outer tube 10 and this return flow of Water passes from the other end of the tube 10 into the tube 29 and into any'suitable outlet. It will be seen that there is thus provided a continual flow of cold water within the burner which will at all times keep the burner cool and prevent burning or expansion thereof. It will therefore be observed that the device will be highly efiicient and that it ill have long life.

' Vhile we have shown and described the preferred embodiment of our invention, it is of course to be understood that we reserve the right'to make such changes in the :torm

. 7 construction, and arrangement of parts as will not depart from the spirit of the invention or the scope of the subjoined claim.

Having thus described our invention, we claim:

A blow pipe of the character described comprising an outer tube serving as a cas ing, a fitting secured within one end of said tube and provided with a pair of passages,

an extension on said fitting through which one of said passages extends, a burner detachably engaged upon said fitting and in cluding inner and outer portions defining an annular space with which the other passage communicates, a pair of tubes extending longitudinally within said outer tube and secured within'said fitting in communication with the passages therein, said fitting being provided with holes communicating with said annular space and the interior of said outer tube around said second named tubes, one of said second named tubes coinmunicating with said. first named passage and serving as'a gas conduit and the tube connected with the second named passage serving as awater inlet. v

In testimony whereof we afiix'our signa tures. 1

ERNEST CLIFFORD MEEKER. WVALTER BYRON XVOODSIDE. 

